General Information:
Chemical Formula:Al2Si2O5(OH)4
Composition:(Molecular Weight = 258.16 gm)Aluminum 20.90 %
AlSilicon 21.76 %
SiHydrogen 1.56 %
H Oxygen 55.78 %
O Empirical Formula: Al2Si2O5(OH)4
Name Origin:Named after O. d'Halloy (1707-1789).
Physical Properties: Cleavage:None
Color:white, yellowish white, reddish white, brownish white, or greenish white.
Density:2 - 2.6, Average = 2.29
Diaphaniety:Translucent to opaque
Habits:Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite)., ,
Hardness:2 - Gypsum
Luminescence:None.
Luster:Earthy (Dull)
Streak:white
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